Neil Hilary

Our spreadsheet methodology has criteria for designing, building, and validating spreadsheets to ensure that they work correctly.

This early spreadsheet, a Babylonian clay tablet c.1800 BC, contains several errors. How many errors do your spreadsheets have?

See our bibliography of spreadsheet best practice, risk management, errors and testing, and methods for improving spreadsheets.

Only a quarter of survey participants were satisfied with their spreadsheet testing. Their techniques are largely manual and lack formalism.

"Oh My God" my formulas are not working! This article covers most of the reasons for Excel formulas not working. And how to fix them.

Once information is loaded into a spreadsheet, it acquires properties that it may not deserve – a process called reification.

The cascading structure of typical spreadsheet formulae means that just about every spreadsheet is almost certainly wrong.

Good spreadsheets are essential for informing decision making. But most spreadsheets are not good. We help you make better spreadsheets.